Insults.

Far less powerful than given credit for.

When you use two little things.

Pacification.

Humorification.

Somebody says you're as dumb as a rock.

Don't escalate.

Self-denigrate.

Tell them.

"You don't know the half of it."

"I'm a lot dumber than a whole box of rocks."

Boom.

Walk on, brothers and sisters.